And not that they have the runway to do this (bad pun), but to do a SpaceX style rapid iteration on design / production techniques that could make it happen.
It's not that I weep for the rich to be unable to fly around the world faster than the rest of us -- just general fascination with technology and where it can go.
It is a much more expensive proposition for supersonic cruise engines than subsonic so even more critical you get an engine OEM onboard, figure out your market, and get a solid design point nailed down quickly. If you're off even a little bit in efficiency, it will very significantly affect the aircraft's market viability. If I were an engine company, I wouldn't put my own R&D funds into this area yet, and especially not toward Boom's design point.
Even more stupid things than Boom: commercial endoatmospheric hypersonics, and SpinLaunch. I can't believe SpinLaunch has funding.
The one "science fiction becomes reality" concept that could one day (not today) be viable is sub-orbital (exoatmospheric) point-to-point transport. But there's a long way to go to make that more routine and it's hard to see a path to safety better than subsonics. Subsonic/transonic commercial transport is a real sweet spot.
Claimer: I'm a practicing aerospace engineer, and do not work for Boom or their competitors.
Also, I didn't really answer your question directly before, but SpaceX-style iteration in this arena is unlikely. Unlike launch, which has high margins, commercial supersonics would be competing by trying to "build a better mousetrap" where "better" means "faster, but more expensive to develop, operate, and has a smaller addressable market". Iteration could build design team competence, but iterating the design itself would be extremely expensive and wouldn't have enough potential payoff to merit the necessary $Billions of pre-production investment.
My naivete as a software guy is that the advancements and cost drop of computational modelling, ML/AI, and 3D printing could enable a small team of smart people the opportunity to "think outside the box".